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I understand that cis fats increases hdl's, and unsaturated fat increases ldl's, but trans fat increases hdl's and it decreases ldl's. Why does trans fat do this?

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cis fats don't increase LDL. I think you've got them mixed up. Is your question why trans fats exert an effect on both HDL and LDL? –  Alexandria Jan 28 '13 at 6:54
Yeah I think that is back to front :) –  Rory M Jan 28 '13 at 10:55
Thanks. I fixed it. –  Orcris Jan 28 '13 at 12:27
You might find this interesting: jn.nutrition.org/content/135/9/2075.full It doesn't directly answer your question, but it discusses potential mechanisms and is a good read in any case. –  Alexandria Feb 1 '13 at 7:31

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